下列说法正确的是( ) A.沿着电场线移动电荷,电场力一定要做正功 B.电荷沿电

题型:选择题

问题:

下列说法正确的是(  )

A.沿着电场线移动电荷,电场力一定要做正功

B.电荷沿电场线移动,其电势能一定减少

C.同一电荷在电场线密的地方电势能大

D.同一电荷在电场线密的地方受电场力大

考点:电场强度的定义式电势能
题型:选择题

患者,女性,21岁,因牙齿不齐,暴牙而求治,病史不详。中度开唇露齿,凸面型,下颌后缩。两侧磨牙,尖牙均远中关系,下颌角大,前牙覆4mm,覆盖9mm,上牙列拥挤度为8mm,ANB角为8°。

此患者应诊断为()

A.安氏Ⅰ类

B.安氏Ⅱ类1分类

C.安氏Ⅲ类

D.安氏Ⅱ类2分类

E.安氏Ⅲ类2分类

题型:选择题

心脏后前位X线片心脏阴影向两侧增大,心缘弧度消失呈烧瓶状的是()

A.二尖瓣狭窄

B.心包积液

C.心肌病

D.高血压性心脏病

E.肺源性心脏病

题型:选择题

阅读下面短文并回答问题,然后将答案写到答题卡相应的位置上(请注意每题词数要求)。

[1]Freezing weather can mean frostbite(冻伤)and hypothermia(体温过低)unless a person is prepared. Today we talk about how to stay warm,dry and safe.

[2]Frostbite is damage that happens when skin is exposed to extreme cold for too long.It mainly happens on the hands,feet,nose and ears.If deeper tissue is affected, a person is likely to feel pain every time the area gets cold.Hypothermia is a condition that develops when the body cannot produce as much heat as it:releases.Signs of hypothermia include uncontrollable shaking,very slow breathing and difficulty thinking clearly.

[3] To avoid cold-related injuries,here is a simple way to remember four basic steps to staying warm.Think of COLD—C.O.L.D.

[4]The C stands for cover.Wear a hat and scarf to keep heat from escaping through the head,neck and ears.And wear mittens(连指手套)instead of gloves.

[5]The O stands for overexertion(用力过度).Avoid activities that will make you sweaty.Wet clothes and cold weather are a dangerous combination.

[6] L is for layers.Wearing loose,lightweight clothes,one layer on top of another,is better than wearing a single heavy layer of clothing.

[7]D is for dry.In other words,stay as dry as possible.Pay attention to the places where snow can enter clothing.These include the tops of boots,the necks of coats and the wrist areas of mittens or gloves.

[8] And here are two other things to keep in mind-one for children and    .Eating snow might be fun but it lowers the body’s temperature.And drinking alcohol might make a person feel warm.But what it really does is weaken the body’s ability to hold heat.

小题1:For what purpose did the writer write this passage?(no more than l5 words)

                                                                           

小题2:List two signs of hypothermia.(no more than 8 words)

                                                                           

小题3:Should we drink alcohol to keep warm? Why or why not? (no more than 15 words)

                                                                           

小题4:Fill in the blank in Paragraph 8 with proper words.(no more than 6 words)

                                                                           

小题5:Translate the underlined sentence in Paragraph 2 into Chinese.

                                                                       

题型:选择题

没有数据来源,且可以用来显示信息、线条、矩形或图像的控件的类型是

A.结合型

B.非结合型

C.计算型

D.非计算型

题型:选择题

________而_______为原醛的特点,如二者皆高则应考虑________。

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